High temperatures in summer are a critical period for the growth and management of paeoniarockii. High temperatures, strong light and rain may cause leaf burns, root rot and other problems. The following summer management points are summarized to help the plants survive the summer safely and lay the foundation for flowering next year:
- Reasonable watering and drainage
- Watering principles
Keep the soil moist but avoid waterlogging. The roots of purple peony are afraid of waterlogging, and waterlogging can easily lead to root rot.
Watering time: early morning or evening, avoid high temperatures at noon, and the water temperature should be close to the soil temperature.
Drought response: Water thoroughly every 5-7 days during continuous drought to prevent the soil from drying and cracking and damaging the roots.
- Drainage measures
Check the waterlogging immediately after heavy rain. For ground-planted plants, a circular drainage ditch with a radius of 40 cm can be dug at the base.
Potted plants can be slightly tilted to reduce rainwater accumulation. Straighten and pour out the accumulated water in time after rain.
- Scientific shading and light management
- Shading requirements
Although paeoniarockii likes light, strong light in summer can easily burn leaves, especially seedlings and potted plants.
Potted plants: move to scattered light or use a shade net (shading rate 30%-50%), and avoid placing it on a concrete floor or other place with strong reflected light.
Ground planting: plant low plants around or set up a temporary sunshade to reduce the intensity of direct light. - Light adjustment
If the plant has dry tips and dry edges of leaves, it is necessary to strengthen shading and spray water on the leaves to cool down. - Fertilization and soil management
- Fertilization strategy
Critical period: June-July is the period of flower bud differentiation, and phosphorus and potassium fertilizers (such as potassium dihydrogen phosphate) need to be supplemented to promote differentiation.
Note: Suspend fertilization during high temperature periods (above 35°C) and avoid using uncomposted organic fertilizers or concentrated fertilizers to burn roots. - Soil improvement
Covering and moisture retention: Cover the roots with pine needles, shredded bark or straw (3-5 cm thick), which can not only reduce temperature and retain moisture, but also suppress weeds.
Loosening and ventilation: After rain or watering, loosen the soil shallowly to prevent compaction and improve root respiration.
- IV. Disease and pest control
- Common diseases
Leaf spot/brown spot: Spray 600 times of carbendazim or 800 times of thiophanate-methyl, once every 15-20 days.
Root rot: After controlling water, apply fungicides such as benomyl, and strengthen drainage. - Pest control
Red spider/aphids: Spray avermectin or matrine solution.
Grubs: Sprinkle phoxim granules for prevention.
The above measures can effectively reduce the damage of high temperature and humidity in summer to paeoniarockii, ensure the healthy growth of plants, and lay the foundation for root development in autumn and flowering next year. If you need to further optimize the management plan, please refer to the specific planting environment adjustment details.